New-generation aerospace equipage and instrumentation are faster, but they are not always better or necessary. Just like people, older avionics are still useful and even needed.

As autonomous technology advances in aviation, development depends on having the most modern versions of components like:

• Power units
• Distribution systems
• Processors
• Microcontrollers
• Sensors
• Chips
• Diodes
• Connectors

However, many aircraft registered in the United States do not depend on these next-generation technologies.

The general aviation fleet ranges from home-built aircraft to business jets, but the majority are piston-powered propeller or turboprop aircraft.

The equipage meets airworthiness standards ranging from pre-FAA days to concepts beyond the current regulator’s thinking. Most of these aircraft have not been upgraded in any significant way and thus depend upon “old” technology that is out of production and getting hard to find in new condition.

Some of the most revered aircraft in the aging fleet run on analog equipment or first-generation sensor systems.

Finding new replacement parts for outdated technology is becoming increasingly difficult. Companies that once made these items have adopted newer versions that do more, commensurate with environmental restraints and raw material demands.

As aptly pointed out in the Aerospace Supply Chain Resiliency Task Force Report to Congress:

Most of the raw materials essential to aerospace and aeronautical development must be obtained from other countries. The ability to obtain raw minerals from U.S. sources is curtailed by federal and state environmental laws.

Use of new or different materials is curtailed by aerospace certification requirements which entail development of experience or tests and conformity to an approved specification,50 a process that can take decades, not just years. The FAA’s inability to adapt to new or different materials or new technology in older aircraft is problematic.

The need to continue support for older systems extends to all aircraft certificated by the agency as well as the infrastructure supporting the NAS’ critical infrastructure and systems. The agency’s essential role in national security requires system redundancy to ensure the continuation of the NAS, even if one system is compromised.

Older aircraft use legacy computer chip technology and, while there is a push to ensure newer computer technology can be manufactured in the United States, the need for older generation chips remains. Rigorous certification processes and requirements, further, inhibit the ability to efficiently update avionics with newer generation chips, and so even for modern aircraft the chips in use are typically not interchangeable with current generation chips.

To ensure airworthiness, the replacement item must return the aircraft to at least its original condition.

The ability to determine equivalency to the original design parameters and conditions—and thus the eligibility for installation in an article—is in the hands of certificated maintenance providers.

The design and production approval holders may also assist in these endeavors provided the motivation is replacing, not upgrading.

In any event, maintaining older avionics will become increasingly challenging—not too different from older people.